package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void save(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //判断当前商品是否在购物车中
        List<ShoppingCart> shoppingCarts = shoppingCartMapper.list(shoppingCart);
        //如果已经存在，就更新数量，数量加1
        if (shoppingCarts != null && !shoppingCarts.isEmpty()){
            ShoppingCart shoppingCart1 = shoppingCarts.get(0);
            shoppingCart1.setNumber(shoppingCart1.getNumber() + 1);
            shoppingCartMapper.updateNumberById(shoppingCart1);
        } else{
            //判断当前添加到购物车的是菜品还是套餐
            Long dishId = shoppingCart.getDishId();
            if (dishId != null){
                //添加到购物车的是菜品
                Dish dish = dishMapper.selectById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else{
                //添加到购物车的是套餐
                Setmeal setmeal = setmealMapper.getById(shoppingCart.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            //如果不存在，插入数据，数量就是1
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 减少购物车中的一件商品
     * @param shoppingCartDTO
     */
    @Override
    public void deleteOne(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> shoppingCarts = shoppingCartMapper.list(shoppingCart);
        if (shoppingCarts!= null &&!shoppingCarts.isEmpty()){
            ShoppingCart shoppingCart1 = shoppingCarts.get(0);
            if (shoppingCart1.getNumber() == 1){
                //如果数量为1，就删除
                shoppingCartMapper.deleteById(shoppingCart1.getId());
            } else{
                //如果数量大于1，就减少数量
                shoppingCart1.setNumber(shoppingCart1.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart1);
            }
        }
    }

    /**
     * 查询购物车
     * @param shoppingCart
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart(ShoppingCart shoppingCart) {
        return shoppingCartMapper.list(shoppingCart);
    }

    @Override
    public void deleteByUserId() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }
}
